Format is having issues, when moving between tracks. The first sector written after moving to next track isn’t reliably readable. A rewrite of the track, always works. I’m going to have to review my power supply, as I’m guessing that I’m not providing enough juice to cleanly power the stepper motors. This is something I’ve suspected before, but haven’t taken the time to fully investigate. Now appears to be a good time, since it is getting in the way of finishing the format function.